(Reuters) - VirnetX Holding Corp, an internet security software company, said a district court has upheld a previous patent infringement ruling against Apple Inc and denied the iPhone maker's motion to reduce the $368 million in damages. VirnetX was awarded the damages in November after a federal jury said Apple had infringed the company's patents for virtual-private-network technology to use in Apple's FaceTime video-calling function. The U.S. ...